A quantitative systematization of hydrogen-induced changes in Debye temperatures of metals

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Abstract

Nuclear resonance scattering of γ rays has recently been used to obtain information on the Debye temperatures θD, of metal hydrides. In particular the contribution of nickel to the θD of Mg2Ni, LaNi5 and their hydrides was estimated. It was assumed that the different behaviour of θD for nickel in the two cases (i.e. an increase upon hydrogenation in Mg2Ni and no change in LaNi5) could be related to the different stabilities of the two hydrides. Consequently an empirical relationship connecting the Debye temperatures θM and θH of a metal and its hydride respectively with the heat ΔHf of formation of the hydride was derived from experimental data reported by various investigators. It appeared, however, that two ambiguous calculating procedures were used to derive the θH values. One of these procedures was used consistently in the present work for all the metal-hydrogen systems and the original phenomenological rule was changed accordingly. The qualitative theoretical considerations preceding the derivation of the empirical relation are briefly presented. Some experimental data recently reported in the literature are discussed in terms of the proposed empirical rule. In particular the obvious exceptions associated with the group IVa metal hydrides TiHx and ZrHx are attributed to the Jahn-Teller effect in these systems.

Original languageEnglish
Pages (from-to)309-316
Number of pages8
JournalJournal of the Less-Common Metals
Volume89
Issue number2
DOIs
StatePublished - 1 Jan 1983

ASJC Scopus subject areas

  • Engineering (all)

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